纳米氧化镁表面修饰制备荷正电微孔陶瓷膜及其性能研究

以硅藻土陶瓷膜为基膜,氯化镁和尿素为原料合成含镁先驱体溶胶,通过浸渍-热分解法对硅藻土基膜进行表面改性制得纳米MgO/SiO_2荷正电微孔陶瓷膜,并对其组成结构及水中四环素去除性能进行研究。结果表明,荷正电的纳米MgO涂层呈现立方型晶粒,并均匀地附着在基膜表面,因此使得荷正电微孔陶瓷膜具有较高的电性能,并且在较宽的pH值范围内带正电,其等电点为10.8。最后对水中四环素的去除性能进行研究,结果表明荷正电微孔陶瓷膜对水中四环素具有很好的去除效果,在室温、常压条件下,其对四环素的COD去除率高达98.8%,色度去除率为99.7%。

Preparation and Performance of Positively Charged Microporous Ceramic Membrane Modified by Nano-MgO

Using diatomite ceramic membrane as base membrane, the nano-MgO/SiO₂ microporous ceramic membranes with positive surface charge was prepared by impregnation-thermal decomposition method for surface modification of the base membrane. Composition structure of the positively charged microporous ceramic membrane and removal performance for tetracycline in water were analyzed. Research results showed that the positively charged nano-MgO coating exhibits a cubic crystal and uniformly attached to the base membrane surface, as a result the positively charged microporous ceramic membrane possesses high electrical properties. It behaves positive surface charge within a wide pH range, and its isoelectric point is up to 10.8. Finally, the removal performance of tetracycline confirmed a satisfactory removal effect for tetracycline of the positively charged microporous ceramic membrane, as the COD removal rate and chroma removal rate were 98.8% and 99.7%, respectively at room temperature and under atmospheric pressure.